E-Print Archive

There are 4115 abstracts currently viewable.


Advanced Search
Main Page Add New E-Print Submitter
News Help/FAQ About Preferences
Manage Key Phrase
Heating and cooling of coronal loops with turbulent suppression of parallel heat conduction View all abstracts by submitter

Eduard Kontar   Submitted: 2017-12-01 06:07

Using the "enthalpy-based thermal evolution of loops" (EBTEL) model, we investigate the hydrodynamics of the plasma in a flaring coronal loop in which heat conduction is limited by turbulent scattering of the electrons that transport the thermal heat flux. The EBTEL equations are solved analytically in each of the two (conduction-dominated and radiation-dominated) cooling phases. Comparison of the results with typical observed cooling times in solar flares shows that the turbulent mean free-path λT lies in a range corresponding to a regime in which classical (collision-dominated) conduction plays at most a limited role. We also consider the magnitude and duration of the heat input that is necessary to account for the enhanced values of temperature and density at the beginning of the cooling phase and for the observed cooling times. We find through numerical modeling that in order to produce a peak temperature ≃ 1.5 x 107 K and a 200 s cooling time consistent with observations, the flare heating profile must extend over a significant period of time; in particular, its lingering role must be taken into consideration in any description of the cooling phase. Comparison with observationally-inferred values of post-flare loop temperatures, densities, and cooling times thus leads to useful constraints on both the magnitude and duration of the magnetic energy release in the loop, as well as on the value of the turbulent mean free-path λT.

Authors: Bian, Nicolas; Emslie, A. Gordon; Horne, Duncan; Kontar, Eduard P.
Projects: RHESSI

Publication Status: accepted for publication in ApJ
Last Modified: 2017-12-01 11:37
Go to main E-Print page  Determination of Linear Force-Free Magnetic Field Constant Alpha Using Deep Learning  Solar Energetic Particle Forecasting Algorithms and Associated False Alarms  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

Go to main E-Print pageGo to main E-Print page.
Previous AbstractPrevious Abstract.
Next AbstractNext Abstract.
Download PreprintDownload Preprint.
Submitter's HomepageSubmitters Homepage.
Edit EntryEdit Entry.
View All Abstracts By SubmitterView all abstracts by submitter.
Delete AbstractDelete abstract.

Latest Entries
Non-Stationary Fast-Driven Self-Organized Criticality in Solar Flares
Global Energetics of Solar Flares. IX. Refined Magnetic Modeling
The Solar Orbiter SPICE instrument - An extreme UV imaging spectrometer
Anisotropic Radio-Wave Scattering and the Interpretation of Solar Radio Emission Observations
Large-amplitude quasi-periodic pulsations as evidence of impulsive heating in hot transient loop systems detected in the EUV with SDO/AIA
Dynamic Evolution of Current Sheets, Ideal Tearing, Plasmoid Formation and Generalized Fractal Reconnection Scaling Relations
Characteristics of solar wind rotation
A Study of Pre-Flare Solar Coronal Magnetic Fields: Magnetic Flux Ropes
New Solar Irradiance Measurements from the Miniature X-Ray Solar Spectrometer Cubesat
MinXSS-1 CubeSat On-Orbit Pointing and Power Performance: The First Flight of the Blue Canyon Technologies XACT 3-axis Attitude Determination and Control System
The Multi-instrument (EVE-RHESSI) DEM for Solar Flares, and Implications for Nonthermal Emission
A Statistical Study of Solar Filament Eruptions That Forms High-Speed Coronal Mass Ejections
Reversed dynamo at small scales and large magnetic Prandtl number
Three-dimensional Density Structure of a Solar Coronal Streamer Observed by SOHO/LASCO and STEREO/COR2 in Quadrature
Modelling Mg II During Solar Flares, I: Partial Frequency Redistribution, Opacity, and Coronal Irradiation
The Birth of a Jet-driven Twin CME and Its Deflection from Remote Magnetic Fields
On the Origin of Solar Torsional Oscillations and Extended Solar Cycle
What Sets the Magnetic Field Strength and Cycle Period in Solar-type Stars?
Stereoscopic Observations of an Erupting Mini-filament Driven Two-Sided-Loop Jet and the Applications for Diagnosing Filament Magnetic field
Dynamic Processes of the Moreton Wave on 2014 March 29

Related Pages
MSU Solar Physics.
Max Millennium Science Mail Archive.
Max Millennium Message of the Day Mail Archive.
Max Millennium Flare Catalog

Archive Maintainer
Alisdair Davey

© 2003 Solar Physics Group - Montana State University